Plain text has its limits. Good open-source markup options are available (or you can roll-your-own). They're fine so long as they will export into truly plain-t

Plain text has its limits. Good open-source markup options are available (or you can roll-your-own). They're fine so long as they will export into truly plain-text in a satisfactory way. For text that I expect to use for a long time, I will never again use programs that use proprietary text formats. Once you commit to them you're at the mercy of the proprietor - and the platform (if they're not cross-platform). The programs may even fail after an OS update. That's a burn that's not soon forgotten.